Students are usually given evening shifts and are guaranteed to work basically every weekend. If you aren't a student and this will be your main source of income (i.e., you don't have another job), mention that you're available to work early-morning stocking shifts. These usually start as early as 5 or 6 in the morning, and run anywhere from 5 to 9 hours, with a 45-minute lunch break offered for all shifts at and over 6 hours.